Parents and relatives visit a mass grave of school children who were killed in last year's earthquake in the devastated town of Balakot, 180 km (112 miles) from Islamabad, October 8, 2006. Pakistan united in mourning on Sunday in memory of about 73,000 people killed in an earthquake exactly a year ago, while survivors vented their frustration over the pace of reconstruction. REUTERS/Ibrar Tanoli (PAKISTAN)